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/*
Unix SMB/CIFS implementation.
POSIX NTVFS backend - structure definitions
Copyright (C) Andrew Tridgell 2004
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _VFS_POSIX_H_
#define _VFS_POSIX_H_
#include "smb_server/smb_server.h"
/* this is the private structure for the posix vfs backend. It is used
to hold per-connection (per tree connect) state information */
struct pvfs_state {
struct smbsrv_tcon *tcon;
const char *base_directory;
const char *share_name;
uint_t flags;
struct pvfs_file *open_files;
struct pvfs_mangle_context *mangle_ctx;
struct brl_context *brl_context;
struct odb_context *odb_context;
struct sidmap_context *sidmap;
/* an id tree mapping open search ID to a pvfs_search_state structure */
struct idr_context *idtree_search;
/* an id tree mapping open file handle -> struct pvfs_file */
struct idr_context *idtree_fnum;
/* a list of pending async requests. Needed to support
ntcancel */
struct pvfs_wait *wait_list;
/* the sharing violation timeout */
uint_t sharing_violation_delay;
/* filesystem attributes (see FS_ATTR_*) */
uint32_t fs_attribs;
};
/* this is the basic information needed about a file from the filesystem */
struct pvfs_dos_fileinfo {
NTTIME create_time;
NTTIME access_time;
NTTIME write_time;
NTTIME change_time;
uint32_t attrib;
uint64_t alloc_size;
uint32_t nlink;
uint32_t ea_size;
uint64_t file_id;
uint32_t flags;
};
/*
this is the structure returned by pvfs_resolve_name(). It holds the posix details of
a filename passed by the client to any function
*/
struct pvfs_filename {
const char *original_name;
char *full_name;
const char *stream_name; /* does not include :$DATA suffix */
uint32_t stream_id; /* this uses a hash, so is probabilistic */
BOOL has_wildcard;
BOOL exists; /* true if the base filename exists */
BOOL stream_exists; /* true if the stream exists */
struct stat st;
struct pvfs_dos_fileinfo dos;
};
/* open file handle state - encapsulates the posix fd
Note that this is separated from the pvfs_file structure in order
to cope with the openx DENY_DOS semantics where a 2nd DENY_DOS open
on the same connection gets the same low level filesystem handle,
rather than a new handle
*/
struct pvfs_file_handle {
int fd;
struct pvfs_filename *name;
/* a unique file key to be used for open file locking */
DATA_BLOB odb_locking_key;
/* a unique file key to be used for byte range locking */
DATA_BLOB brl_locking_key;
uint32_t create_options;
/* this is set by the mode_information level. What does it do? */
uint32_t mode;
/* yes, we need 2 independent positions ... */
uint64_t seek_offset;
uint64_t position;
BOOL have_opendb_entry;
/* we need this hook back to our parent for lock destruction */
struct pvfs_state *pvfs;
/* have we set a sticky write time that we should remove on close */
BOOL sticky_write_time;
};
/* open file state */
struct pvfs_file {
struct pvfs_file *next, *prev;
struct pvfs_file_handle *handle;
uint16_t fnum;
struct pvfs_state *pvfs;
uint32_t impersonation;
uint32_t share_access;
uint32_t access_mask;
/* we need to remember the session it was opened on,
as it is illegal to operate on someone elses fnum */
struct smbsrv_session *session;
/* we need to remember the client pid that
opened the file so SMBexit works */
uint16_t smbpid;
/* a list of pending locks - used for locking cancel operations */
struct pvfs_pending_lock *pending_list;
/* a count of active locks - used to avoid calling brl_close on
file close */
uint64_t lock_count;
};
struct pvfs_mangle_context {
uint8_t char_flags[256];
/*
this determines how many characters are used from the original
filename in the 8.3 mangled name. A larger value leads to a weaker
hash and more collisions. The largest possible value is 6.
*/
int mangle_prefix;
uint32_t mangle_modulus;
/* we will use a very simple direct mapped prefix cache. The big
advantage of this cache structure is speed and low memory usage
The cache is indexed by the low-order bits of the hash, and confirmed by
hashing the resulting cache entry to match the known hash
*/
char **prefix_cache;
uint32_t *prefix_cache_hashes;
/* this is used to reverse the base 36 mapping */
unsigned char base_reverse[256];
};
/* flags to pvfs_resolve_name() */
#define PVFS_RESOLVE_WILDCARD (1<<0)
#define PVFS_RESOLVE_STREAMS (1<<1)
/* flags in pvfs->flags */
#define PVFS_FLAG_CI_FILESYSTEM (1<<0) /* the filesystem is case insensitive */
#define PVFS_FLAG_MAP_ARCHIVE (1<<1)
#define PVFS_FLAG_MAP_SYSTEM (1<<2)
#define PVFS_FLAG_MAP_HIDDEN (1<<3)
#define PVFS_FLAG_READONLY (1<<4)
#define PVFS_FLAG_STRICT_SYNC (1<<5)
#define PVFS_FLAG_STRICT_LOCKING (1<<6)
#define PVFS_FLAG_XATTR_ENABLE (1<<7)
#define PVFS_FLAG_FAKE_OPLOCKS (1<<8)
/* forward declare some anonymous structures */
struct pvfs_dir;
/* types of notification for pvfs wait events */
enum pvfs_wait_notice {PVFS_WAIT_EVENT, PVFS_WAIT_TIMEOUT, PVFS_WAIT_CANCEL};
/* putting this prototype here avoids us having to expose this whole header in the
rest of Samba */
void *pvfs_wait_message(struct pvfs_state *pvfs,
struct smbsrv_request *req,
int msg_type,
struct timeval end_time,
void (*fn)(void *, enum pvfs_wait_notice),
void *private);
#endif /* _VFS_POSIX_H_ */
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